removing the sub header under the menu

Another question from me. I would like to have the option of removing the header under the menu headings. I mean the grey section. If you look at my site: http://nicadesign.co/windows , I want to have the menu headings and then for the text to follow withought this grey area.

Would be grateful if you could tell me how to remove this light grey header area as I can’t find it anywhere.

Thanks,
Peter

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